import java.lang.reflect.Array;
import java.util.Arrays;

public class test {
    public static void main(String[] args) {
        String m = "1";
        //冒泡排序
        int[] arr = {5,2,3,1};
        //定义循环几次
        for (int i = 0; i < arr.length-1; i++) {
            for (int j = 0; j < arr.length -i -1; j++) {
                if (arr[j] > arr[j + 1]) {
                    int temp = arr[j + 1];
                    arr[j+1] = arr[j];
                    arr[j] = temp;
                }
            }

        }
        System.out.println(Arrays.toString(arr));
    }

}
